Yep, time for a new agent, that sounds odd to me. How many machines sold/traded in a year constitute a business and how the hell would they know anyway.
I've had Statefarm for over 30 years and although I haven't had to make a claim for a pinball machine I have had a few claims over the years and they have always treated me very fairly and without hassle. I can't even imagine them interrogating me on just how many pinball machines I sold over the last year.
It might be wise for you to have shorter conversations with your agent.